|
| |
TM 10-4320-343-14
Table 4-2.1. Unit Troubleshooting Table (Model 350 PAFN). (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 8
Start system and check for 3 to 4 Vdc at wiper contact (green wire) to ground of mode switch in
pressure controller (Figure 4-53).
a. If voltage is available, replace actuator control box (paragraph 4.14.4).
b. If voltage is absent replace pressure controller (paragraph 4.14.2).
5. OIL PRESSURE READING LOW.
WARNING
Do not smoke or use spark or flame producing equipment while troubleshooting.
Move equipment off line and have a fire extinguisher at hand when troubleshooting
involves electrical circuits.
Failure to heed these warnings may result in death or serious injury of personnel.
Step 1
Briefly apply 12 Vdc to the positive contact and a ground directly to the gauge and note if needle
deflects all the way to the right.
If gauge does not show a full deflection, replace gauge (paragraph 4.10.19).
CAUTION
Engine may not get sufficient lubrication and will be damaged if operated longer
then a few seconds when little or not oil pressure is indicated.
Step 2
Disconnect wire from oil pressure sender (item 2, Figure 4-29) and start engine. With engine running,
check for resistance between sender contact and engine block (ground). Note that when rpm is
increased, resistance goes down to a minimum of approximately 30 Ohms and when engine speed is
decreased, resistance will go up to a maximum of 120 Ohms at idle.
Replace oil sender(paragraph 4.10.19) if these indications are not correct.
Step 3
Test system wiring (paragraph 4.12.4.1).
Replace wiring (paragraph 4.12.5.1) if defective.
Step 4
Test control panel (paragraph 4.13.2.1).
Repair control panel (paragraphs 4.13.3 through 4.13.10) if defective.
Step 5
Notify Direct Support Maintenance.
Change 1 4-10.7
|
